How to Change Video Background??

Hi Ppl
I am newbie here on this forum site ...........
so please anyone help me ... i have a little question ?How to change Videos Background....
i have all video editing softwarez just
suggest me which one help me to do that?
Pinnacle ? Ulead Media ? Magix movie ? Muvee? primiere?
Power director?Magic Edit? After effect?
I will wait for your answer ...

The only way i can think of doing this is using chroma key.
You would have to film the newscaster against a blue or green background and then use the blue or green screen effect in premiere pro to replace the blue or green colour with the sports video.